For Linux

SqlBak for Linux is free

Create full, incremental and differential backups of

and send them to

Local/Network folder, External HDD/NAS
Amazon S3
Dropbox
OneDrive for Business
Google Drive
FTP
Windows Azure Storage
OneDrive
Linux
Free
Server down alerts every 5 min
Backup History 12 months
AES Encryption
Server health check every 60 min
Extended support