Best practice

Although this backups tool can deal with a lot of provider some might still make trouble.

Mittwald
Runs perfect out of the box.

Hetzner
Special ssh port 222. You need to change M_OPTIONS="" to M_OPTIONS="-p222"

1und1
There is no tunneling support for 1und1 managed server and the database is not accessible from outside. This means remote database backups are not possible. You need to dump the database via cronjob on the server and store them in a folder which staysafe fetches.
In this case you need to create an own testcase for this server. This is done in the folder testcases. Copy "defalut" to "test_server" and change dumppath to the directory the dumps are stored.

All Inkl.
No ssh tunneling possible, but the database is reachable form outside

Host Europe
Runs perfect out of the box.