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A common fear with any software is being locked in. The honest answer is that your data is yours, and you should never choose a system that treats your own records as a hostage.
Before committing to any POS, ask how you get your data out and in what format. Asking that question up front protects you no matter which system you pick.
Related questions
In what format do I get my data?
Do I lose my history if I cancel?
Veira gives Kenyan shops one calm app for selling, M-Pesa, KRA eTIMS and stock, with a free terminal. Book a demo and see it set up for your trade.