Is there an advantage to doing it this way, instead of
rclone rcat remote:disk.raw < /dev/sda
Will I lose anything with this variation? Or is it risky? How would I know if the image is corrupt?
It gives me non-trivial time savings over dd
I don't think so.
It is the same level of risk as the dd
That is a hard problem in general. Is the disk image changing? If not you could md5sum it (rclone md5sum - < /dev/sda) and compare with the md5sum on the remote (or whatever checksum your remote supports). That would give good confidence that it is intact.
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