Verdict: Yes
Yes. FreeFileSync is published for Linux by the same developer who makes the Windows version, and it is also on Flathub, so the app you know carries over.
The FreeFileSync download page offers Windows, macOS and a Linux download for 64 bit machines. The Linux one comes as a compressed archive rather than a tidy installer, which is more awkward than it needs to be, so most people are better off getting it from Flathub, an app store that Ubuntu, Mint and Fedora can all use. The Flathub listing carries a note saying it is put together by the community rather than the developer, and that is worth knowing.
The app itself looks the same. Two panes, a compare button and a sync button, with the same settings behind them. If you saved your jobs as configuration files on Windows, they open on Linux.
The one thing that needs attention is paths. Any saved job pointing at C drive or a network drive letter has to be repointed at the matching Linux folder, since Linux has no drive letters. Open each job, fix both sides, and save it again.
Before you trust it with anything irreplaceable, run one job on a small test folder and check the preview screen carefully. FreeFileSync will happily delete files to make two folders match, and that is as true on Linux as it was on Windows.
The same app from the same developer, easiest to install through Flathub. Saved jobs open, but drive letters in them need repointing.
Your files: Opens your existing saved sync configuration files. Works on the same ordinary files and folders.
Different idea. It keeps folders matched between machines continuously in the background instead of you pressing sync.
Your files: Does not read FreeFileSync jobs. Works on plain folders.
Better choice if you were really using FreeFileSync as a backup, since it keeps older versions of files rather than mirroring.
Your files: Keeps its own backup store. Does not read FreeFileSync jobs.
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