I really like Duplicati (https://www.duplicati.com/).  It's free and
open-source.

From its website:

"Duplicati works with standard protocols like FTP, SSH, WebDAV as well
as popular services like Backblaze B2, Tardigrade, Microsoft OneDrive,
Amazon S3, Google Drive, box.com, Mega, hubiC and many others."

"Backup files and folders with strong AES-256 encryption. Save space
with incremental backups and data deduplication. Run backups on any
machine through the web-based interface or via command line interface.
Duplicati has a built-in scheduler and auto-updater."

"Duplicati uses strong AES-256 encryption to protect your privacy. You
can also use GPG to encrypt your backup."

"Duplicati can make backups to a large number of targets. For local
backups, all devices can be used that are attached locally or using a
UNC path, like:

External USB hard disk drive
USB thumb drive
Shared folder on another computer in the same network
Network-attached Storage (NAS)

Backups to these targets using the following standard network protocols
are supported:

FTP
FTP (Alternative)
OpenStack Object Storage / Swift
S3 Compatible
SFTP (SSH)
WebDAV
The following Cloud Storage Providers are supported natively by
Duplicati:

Amazon S3
Azure blob
B2 Cloud Storage
Box.com
Dropbox
Google Cloud Storage
Google Drive
HubiC
Jottacloud
Mega.nz
Microsoft Office 365 Groups
Microsoft OneDrive for Business
Microsoft OneDrive
Microsoft SharePoint
OpenStack Simple Storage
Rackspace CloudFiles
Rclone
Sia Decentralized Cloud
Tardigrade Decentralized Cloud Storage
Tencent COS

Other supported targets:

Tahoe-LAFS"

-- Sean

 
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