You could try/experiment with using rclone.
create a config for your desired mount, for example google drive.
Mount that via systemd and then point your backups to that location.
For example:
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[Unit]
Description=rclone Service Google Drive Mount
Wants=network-online.target
After=network-online.target
[Service]
Type=notify
Environment=RCLONE_CONFIG=/root/.config/rclone/rclone.conf
RestartSec=5
ExecStart=/usr/bin/rclone mount google:cloudron /mnt/google \
# This is for allowing users other than the user running rclone access to the mount
--allow-other \
# Dropbox is a polling remote so this value can be set very high and any changes are detected via polling.
--dir-cache-time 9999h \
# Log file location
--log-file /root/.config/rclone/logs/rclone-google.log \
# Set the log level
--log-level INFO \
# This is setting the file permission on the mount to user and group have the same access and other can read
--umask 002 \
# This sets up the remote control daemon so you can issue rc commands locally
--rc \
# This is the default port it runs on
--rc-addr 127.0.0.1:5574 \
# no-auth is used as no one else uses my server
--rc-no-auth \
# The local disk used for caching
--cache-dir=/cache/google \
# This is used for caching files to local disk for streaming
--vfs-cache-mode full \
# This limits the cache size to the value below
--vfs-cache-max-size 50G \
# Speed up the reading: Use fast (less accurate) fingerprints for change detection
--vfs-fast-fingerprint \
# Wait before uploading
--vfs-write-back 1m \
# This limits the age in the cache if the size is reached and it removes the oldest files first
--vfs-cache-max-age 9999h \
# Disable HTTP2
#--disable-http2 \
# Set the tpslimit
--tpslimit 12 \
# Set the tpslimit-burst
--tpslimit-burst 0
ExecStop=/bin/fusermount3 -uz /mnt/google
ExecStartPost=/usr/bin/rclone rc vfs/refresh recursive=true --url 127.0.0.1:5574 _async=true
Restart=on-failure
User=root
Group=root
[Install]
WantedBy=multi-user.target
# https://github.com/animosity22/homescripts/blob/master/systemd/rclone-drive.service
