dietpi-backup: add support for sshfs

Author: MichaIng

CHANGELOG.txt

@@ -5,6 +5,7 @@ New software:
 - fish | A dietpi-software entry for this alternative shell has been added. Aside of installing the fish APT package, a DietPi-specific config script is added to enable dietpi-* aliases and load the dietpi-login script for first run setup and autostart options. Many thanks to @ndrew222 for implementing this software option: https://github.com/MichaIng/DietPi/pull/7452
 
 Enhancements:
+- DietPi-Backup | Support for writing a backup into an sshfs has been added.
 - DietPi-Software | WiringPi: Added support for Orange Pi boards, using the wiringOP sources from Xunlong: https://github.com/orangepi-xunlong/wiringOP
 - DietPi-Software | Spotifyd: Added support for ARMv8 and x86_64 Bookworm/Trixie systems, supported with the latest Spotifyd release.
 - DietPi-Software | RPi.GPIO: Since the modern Raspberry Pi kernel removed support for the legacy GPIO API, python3-rpi-lgpio will now be installed instead, providing an RPi.GPIO compatibility layer for the modern lgpio library.

dietpi/dietpi-backup

@@ -80,7 +80,7 @@
 		fi
 
 		# Check for supported filesystem type
-		if [[ $fs_type =~ ^(ext[2-4]|(f2|btr|x|z)fs)$ ]]
+		if [[ $fs_type =~ ^(ext[2-4]|(f2|btr|x|z|ssh)fs)$ ]]
 		then
 			return 0