I need a backup solution that saves directly to our existing object storage buckets.

Yes. If your existing buckets are S3-compatible object storage, there are several good backup approaches that can write directly to them rather than forcing you into a proprietary cloud repository.

Best options

My first choice would be Veeam if you're backing up VMs, physical servers, Microsoft 365, databases, etc. Veeam can use S3-compatible object storage as a backup repository, including as a target for backup and backup-copy jobs.helpcenter.veeam.com+1

An important distinction: Veeam can be configured so backup data goes directly to object storage, rather than first landing on local disk.docs.aws.amazon.com

Commvault is another strong choice if you have a larger heterogeneous environment. Its current documentation explicitly supports S3-compatible storage such as MinIO, Ceph, Cloudian, NetApp StorageGRID, Scality, VAST, Nutanix Objects, and others.docs.commvault.com

What I'd recommend

If you tell me:

1. What you're backing up — VMware/Hyper-V, physical servers, NAS/files, databases, Microsoft 365, Kubernetes, etc.
2. What object storage you already have — MinIO, Ceph, Cloudian, Wasabi, AWS S3, Dell ECS/ObjectScale, NetApp, etc.
3. Approximate data size and daily change rate.
4. Whether you need immutable/ransomware-resistant backups.

…I can narrow this to 2–3 specific products, including licensing/cost, architecture, and exactly how they'd write into your existing buckets.

If you need a backup utility or platform that targets existing S3-compatible or cloud object storage buckets (like AWS S3, Backblaze B2, Wasabi, MinIO, or Google Cloud Storage) directly without forcing you through a proprietary gateway or middleman storage tier, several solid solutions fit the bill depending on your architecture:

• MSP360 (formerly CloudBerry Backup) : Highly storage-agnostic. It connects directly to over 20 cloud providers and S3-compatible endpoints, allowing you to manage retention, client-side encryption, and object lock (immutability) straight inside your own buckets.
• Veeam Backup & Replication : Features robust native object storage integrations . You can configure S3-compatible buckets directly as "Capacity Tier," "Archive Tier," or primary backup targets with built-in immutability support to protect against ransomware .
• Duplicati : A free, open-source backup client that natively stores encrypted, incremental backups directly to remote storage services including standard S3/S3-compatible APIs, WebDAV, and SSH/SFTP. Great for lighter workloads or server-to-bucket setups.
• Restic / BorgBackup (with rclone) : For lightweight CLI-driven or scriptable server environments, tools like restic support direct initialization and backup to an S3 bucket natively, providing fast, encrypted, and deduplicated block-level backups.

To help narrow down the best fit, could you share:

• What operating systems or workloads are you backing up (e.g., Linux/Windows servers, databases, NAS devices, or virtual machines)?
• Which object storage provider are you currently using?

If you already have S3-compatible object-storage buckets, a practical backup solution is Veeam Backup & Replication. It supports direct backup repositories on Amazon S3 and S3-compatible storage, including on-premises object storage, and can send backup data directly to the bucket.Veeam Software+1

For a simpler file-oriented setup, Restic or Duplicati can also write encrypted backups directly to S3-compatible storage.Exoscale

If you tell me what you're backing up (VMs, servers, databases, or files) and which object storage you already use (S3, MinIO, Wasabi, R2, etc.), I can suggest the appropriate architecture.

A direct-to-object-storage backup solution writes chunked, encrypted data straight to your existing buckets (AWS S3, Google Cloud Storage, MinIO, Wasabi, Backblaze B2, etc.) without requiring a local staging server or proprietary virtual appliance gateway.[reddit.com](https://www.reddit.com/r/sysadmin/comments/1v858yq/reliable_tools_for_s3_bucket_backup_and/)

Depending on your scale and whether you need an enterprise or lightweight tool, here are the top options:

• Kopia - An open-source, fast, and encrypted backup tool that natively connects directly to Amazon S3 and any S3-compatible object storage. It supports client-side encryption, incremental snapshots, deduplication, and custom policies for splitting data blocks across different storage tiers.[reddit.com](https://kopia.io/docs/repositories/)[[2](https://kopia.io/docs/repositories)](https://kopia.io/docs/advanced/storage-tiers/)
• Veeam Backup & Replication - For enterprise environments, Veeam features native Direct-to-Object storage and archive tiers (including Direct to Glacier), letting you point backup jobs straight to object repositories with built-in immutability to protect against ransomware.[reddit.com](https://aws.amazon.com/blogs/storage/cost-efficient-backup-archiving-with-veeam-direct-to-amazon-s3-glacier-storage-classes/)
• MSP360 Managed Backup - A robust centralized backup and recovery platform designed for businesses and MSPs that allows you to "bring your own S3 account" and stream incremental backups directly into your object storage targets.[reddit.com](https://www.reddit.com/r/msp/comments/1uw858h/backup_solutions_that_support_s3_targets/)
• Duplicati - A free, open-source backup client great for smaller workloads or workstations. It uses AES-256 encryption and reliably stores incremental backups on standard S3-compatible object storage buckets.[reddit.com](https://forum.duplicati.com/t/how-to-setup-a-s3-backup/14228)[[2](https://kopia.io/docs/repositories)](https://docs.duplicati.com/backup-destinations/standard-based-destinations/s3-compatible-destination)
• Rclone - While technically a command-line data sync tool rather than a traditional snapshot backup engine, it features built-in rclone sync / copy commands and can be paired with scripting for raw direct-to-bucket transfers.

To help narrow down the best fit, could you share:

• What operating systems or workloads are you backing up (servers, databases, end-user endpoints)?
• What is your approximate total data size and daily change rate?

Here are the top backup solutions that write directly to existing object storage buckets (S3-compatible, MinIO, Backblaze B2, Wasabi, AWS S3, Azure Blob, etc.) without requiring a proprietary intermediate gateway or block storage appliance.

• Kopia : An open-source, fast, and secure backup tool that supports direct-to-object storage via S3, Azure Blob, and Google Cloud Storage. It handles client-side encryption, fast incremental backups with deduplication, and compression natively out of the box.
• Duplicati : A free, open-source backup client that securely stores encrypted, incremental, compressed backups locally or directly to remote object storage providers via S3, WebDAV, Azure, and Google Cloud. It features a clean web-based user interface.
• Rclone : While technically a command-line cloud sync/file management tool, many teams use rclone sync or rclone backup scripts combined with versioning on the bucket side for straightforward, script-driven object storage backups. It supports client-side encryption via rclone crypt.[simplyblock.io](https://simplyblock.io/blog/open-source-tools-for-amazon-s3/)
• Veeam Backup & Replication : For enterprise environments, Veeam allows you to configure S3-compatible object storage or public cloud buckets directly as a "Capacity Tier" or a primary backup repository with native immutability (Object Lock) support.
• BorgBackup (with Borgmatic) : A widely respected deduplicating backup program. While it traditionally requires a Borg server backend, community projects and integrations allow direct chunk storage patterns, though it shines best if paired with an S3-compatible mount or specific backends.

To help narrow down the best fit, tell me:

• What environment are you backing up? (Linux/Windows servers, databases, virtual machines, or local workstation files?)
• Do you prefer a GUI/web interface or a command-line/scripted utility?
• Do you need features like client-side encryption or deduplication before it hits the bucket?

If you need a backup system that writes directly into your existing S3/S3-compatible buckets, several approaches fit:

• Restic — lightweight, open source, encrypted, incremental, deduplicated, and supports S3-compatible endpoints directly.DigitalOcean
• Veeam — more enterprise-oriented; supports Amazon S3 and S3-compatible object storage as backup repositories.Veeam Software
• Commvault — supports backing up S3-compatible storage itself, including object metadata and ACLs.Commvault Documentation
• AWS Backup — appropriate if your existing buckets are Amazon S3; supports continuous and periodic backups, but uses AWS Backup vaults rather than simply writing backup files into your existing bucket.AWS Documentation

If “no proprietary backup cloud, use our existing buckets directly” is the key requirement, I'd focus the evaluation on Restic, Veeam, and Commvault.

Yes. If your existing buckets are S3-compatible object storage, I’d prioritize a backup product that can write directly to those buckets, rather than forcing you to buy another proprietary storage appliance.

Strong options

• Comet Backup — probably the closest fit if “backup directly into our existing buckets” is the primary requirement. It supports Amazon S3 and arbitrary S3-compatible storage, lets you specify the bucket and an optional prefix/subdirectory, and supports direct-to-cloud backups without a storage gateway. It also compresses, encrypts, and deduplicates backup data.Comet Backup Documentation+2
• Veeam — a stronger choice if you need a more traditional enterprise backup platform. Veeam supports S3, S3-compatible storage, Google Cloud Storage, Azure Blob, IBM Cloud Object Storage, Wasabi, and others as object-storage repositories.Veeam Software
• Restic — worth considering for a lightweight, CLI-oriented solution, particularly for servers and application data. It's less of a centralized enterprise backup-management platform than the two above.

What I'd choose

If you tell me what you're backing up—for example:

• VMware/Hyper-V VMs
• Windows/Linux servers
• Microsoft 365
• databases
• NAS/file shares
• Kubernetes
• endpoints

—and what object storage you already have (AWS S3, MinIO, Wasabi, Backblaze B2, Ceph, Cloudflare R2, etc.), I can narrow this down to 2–3 concrete solutions, including licensing/cost, deduplication, encryption, immutability/Object Lock, and whether they can write directly into your existing buckets.

Several strong backup solutions allow you to point backups directly to existing S3-compatible or native object storage buckets (like AWS S3, Backblaze B2, Wasabi, or MinIO) without needing a proprietary intermediary tier.

Top options tailored for direct object storage integration include:

• MSP360 (CloudBerry Backup) : Highly storage-agnostic, letting you decouple your licensing from your storage. It hooks directly into Amazon S3, Google Cloud, Wasabi, Backblaze B2, and generic S3-compatible endpoints with robust scheduling, client-side encryption, and object-lock/immutability support.
• Veeam Backup & Replication : Features comprehensive, native direct-to-object support. You can configure standard object storage or S3-compatible endpoints as primary backup repositories or capacity/archive tiers, complete with immutability settings to protect against ransomware.
• Nakivo Backup & Replication : Known for being lightweight and fast, Nakivo supports direct backups to any AWS S3 or S3-compatible object storage target without requiring a heavy local target appliance.
• Duplicati / Restic / Kopia (Open Source / Lightweight) : If you are looking for free, scriptable, or client-side command-line/GUI tools for smaller scale or specific server workloads, tools like Kopia or Duplicati write encrypted, deduplicated backup chunks directly to standard object buckets natively.

To help narrow down the right fit, could you share:

• What operating systems, VMs, or databases you need to back up (e.g., Windows/Linux servers, VMware, Microsoft 365, databases)?
• What specific object storage provider or S3-compatible platform your buckets are hosted on?

Yes. If you already have S3 or S3-compatible object-storage buckets, I’d prioritize backup software that can use those buckets as a native repository rather than introducing another storage appliance.

Good options

• Veeam Backup & Replication — probably the strongest general-purpose choice for VMware/Hyper-V, physical servers, and mixed environments. It supports Amazon S3 and S3-compatible object storage as backup repositories, including existing repositories.Veeam Software+1
• Commvault — particularly attractive if you also want to back up the object storage itself. It supports S3-compatible systems and can perform full, incremental, and synthetic-full backups of buckets/objects.Commvault Documentation+1
• NAKIVO Backup & Replication — a simpler/lower-overhead alternative with support for a number of S3-compatible vendors. It can use S3-compatible buckets as backup repositories, although its compatibility requirements are more restrictive.NAKIVO Help and Support Center+1

What I'd recommend

If your requirement is essentially:

Servers/VMs → backup software → our existing S3 bucket I'd start with Veeam. Its current documentation explicitly supports S3-compatible object storage as a target for backup and backup-copy jobs.Veeam Software

If your requirement is instead:

Existing object-storage buckets → back them up somewhere else then Commvault becomes more compelling because it has explicit S3-object backup functionality.Commvault Documentation

One important consideration: don't simply give the backup application unrestricted access to your existing production bucket. Ideally, use a dedicated bucket/prefix, separate credentials, encryption, and—where supported—object lock/immutability. Veeam and NAKIVO both have specific requirements/limitations around immutable S3 repositories.Veeam Software+1

If you tell me what you're backing up (VMware, Hyper-V, physical Windows/Linux, Microsoft 365, databases, or the object buckets themselves) and what object storage you have (AWS S3, Wasabi, MinIO, Cloudflare R2, Backblaze, Ceph, etc.), I can narrow this down to 2–3 concrete architectures and approximate costs.