And here you have some of the best simple guides to run LNbits on a VPS
- https://ereignishorizont.xyz/blitzbank/
- https://github.com/massmux/lightstack
- https://github.com/TrezorHannes/vps-lnbits

And I wrote also a guide about more options how to run a LNbits here:
https://darth-coin.github.io/merchants/build-lnbits-app-server-en.html

DarthCoin

lightning

Voltage vs Alby Cloud

Kontext

Instead of host lnbits on voltage you better buy a cheap VPS and host it and install it yourself.
You have also the advantage to use that VPS as your personal VPN using wireguard.

Voltage is 25 bucks when a cheap VPS could be lke 5 bucks and you can do whatever you want.

A lnbits + phoenixd backend works instanly on any simple vps.
If you do not want phoenixd you can use Rizful node as backend through NWC.
Or run a LND in neutrino mode.
In all cases you don't need a full bitcoun node.

Alby hub is the same.
And no, you cannot migrate the data from voltage.