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I personally switched from NextCloud to Syncthing.

Syncthing:

• is easier for me to maintain,
• allows for the “server” to be behind NAT,
• lets me have multiple “servers” at the same time (eg. something at home and a VPS)
• lets me have certain “servers” set as untrusted, so all data on them is encrypted, while others can have it unencrypted for easier access I put “server” in quotes, as Syncthing doesn’t really have a server, all clients are equal peers.

On the other hand, NextCloud:

• gives me a way to share files by link with others,
• lets me browse files via a web interface,
• mobile app lets me access files as I need them instead of having to synchronize everything.

I do - because shipping with Windows means that I pay for a Windows license when buying the product.